class Person {
  name: string = ""
  age: number = 0

  eating() {
    console.log("eating")
  }
}

class Student extends Person {
  sno: number = 0

  studying() {
    console.log("studying")
  }
}

class Teacher extends Person {
  title: string = ""

  teaching() {
    console.log("teaching")
  }
}

const stu = new Student()
stu.name = "coderwhy"
stu.age = 10
console.log(stu.name)
console.log(stu.age)
stu.eating()

